Up to the individual whether they want to call a ladyboy 'he', 'she' or 'it', I guess - though I wouldn't go so far as the rest of your post, bg.
Having said that, as a female, I have no problem with katoeys, transexuals or even drag queens (whole different breed) being called 'she'. After all, there's nothing wrong with a boy exhibiting a bit of ambition...